When ever your would is generated all redstone blocks send out a pulse which if you have a contraption attached to the block it a can mess up your contraption when it sends out this pulse.
MCPE-13010
Redstone blocks send out a pulse when the world is first genorated
Resolved
Cannot Reproduce
0
(Unassigned)
Unconfirmed
Phone - Android - Motorola Moto X
Android 5.1
0.14.0 Beta 1, 0.14.0 Beta 2, 0.14.0 Beta 3
Retrieved
Cleaning up old issues, please reply if affecting 0.14.3 or later.